[PATCH 5.10 092/406] wifi: mwifiex: Fix OOB and integer underflow when rx packets

Greg Kroah-Hartman
2023-09-17T19:23:38Z

From: Polaris Pi <pinkperfect2021@gmail.com>

[ Upstream commit 11958528161731c58e105b501ed60b83a91ea941 ]

Make sure mwifiex_process_mgmt_packet,
mwifiex_process_sta_rx_packet and mwifiex_process_uap_rx_packet,
mwifiex_uap_queue_bridged_pkt and mwifiex_process_rx_packet
not out-of-bounds access the skb->data buffer.

Fixes: 2dbaf751b1de ("mwifiex: report received management frames to cfg80211")
Signed-off-by: Polaris Pi <pinkperfect2021@gmail.com>
Reviewed-by: Matthew Wang <matthewmwang@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230723070741.1544662-1-pinkperfect2021@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/marvell/mwifiex/sta_rx.c | 11 ++++++++++-
.../net/wireless/marvell/mwifiex/uap_txrx.c | 19 +++++++++++++++++++
drivers/net/wireless/marvell/mwifiex/util.c | 10 +++++++---
3 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/sta_rx.c b/drivers/net/wireless/marvell/mwifiex/sta_rx.c
index 0d2adf8879005..685a5b6697046 100644
--- a/drivers/net/wireless/marvell/mwifiex/sta_rx.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_rx.c
@@ -98,6 +98,14 @@ int mwifiex_process_rx_packet(struct mwifiex_private *priv,
rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;

+ if (sizeof(*rx_pkt_hdr) + rx_pkt_off > skb->len) {
+ mwifiex_dbg(priv->adapter, ERROR,
+ "wrong rx packet offset: len=%d, rx_pkt_off=%d\n",
+ skb->len, rx_pkt_off);
+ priv->stats.rx_dropped++;
+ dev_kfree_skb_any(skb);
+ }
+
if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
sizeof(bridge_tunnel_header))) ||
(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
@@ -206,7 +214,8 @@ int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,

rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;

- if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
+ if ((rx_pkt_offset + rx_pkt_length) > skb->len ||
+ sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) {
mwifiex_dbg(adapter, ERROR,
"wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
skb->len, rx_pkt_offset, rx_pkt_length);
diff --git a/drivers/net/wireless/marvell/mwifiex/uap_txrx.c b/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
index 9bbdb8dfce62a..f46afd7f1b6a4 100644
--- a/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
+++ b/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
@@ -115,6 +115,15 @@ static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
return;
}

+ if (sizeof(*rx_pkt_hdr) +
+ le16_to_cpu(uap_rx_pd->rx_pkt_offset) > skb->len) {
+ mwifiex_dbg(adapter, ERROR,
+ "wrong rx packet offset: len=%d,rx_pkt_offset=%d\n",
+ skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
+ priv->stats.rx_dropped++;
+ dev_kfree_skb_any(skb);
+ }
+
if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
sizeof(bridge_tunnel_header))) ||
(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
@@ -379,6 +388,16 @@ int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);

+ if (le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
+ sizeof(rx_pkt_hdr->eth803_hdr) > skb->len) {
+ mwifiex_dbg(adapter, ERROR,
+ "wrong rx packet for struct ethhdr: len=%d, offset=%d\n",
+ skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
+ priv->stats.rx_dropped++;
+ dev_kfree_skb_any(skb);
+ return 0;
+ }
+
ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);

if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
diff --git a/drivers/net/wireless/marvell/mwifiex/util.c b/drivers/net/wireless/marvell/mwifiex/util.c
index d583fa600a296..1f5a6dab9ce55 100644
--- a/drivers/net/wireless/marvell/mwifiex/util.c
+++ b/drivers/net/wireless/marvell/mwifiex/util.c
@@ -405,11 +405,15 @@ mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
}

rx_pd = (struct rxpd *)skb->data;
+ pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);
+ if (pkt_len < sizeof(struct ieee80211_hdr) + sizeof(pkt_len)) {
+ mwifiex_dbg(priv->adapter, ERROR, "invalid rx_pkt_length");
+ return -1;
+ }

skb_pull(skb, le16_to_cpu(rx_pd->rx_pkt_offset));
skb_pull(skb, sizeof(pkt_len));
-
- pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);
+ pkt_len -= sizeof(pkt_len);

ieee_hdr = (void *)skb->data;
if (ieee80211_is_mgmt(ieee_hdr->frame_control)) {
@@ -422,7 +426,7 @@ mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
skb->data + sizeof(struct ieee80211_hdr),
pkt_len - sizeof(struct ieee80211_hdr));

- pkt_len -= ETH_ALEN + sizeof(pkt_len);
+ pkt_len -= ETH_ALEN;
rx_pd->rx_pkt_length = cpu_to_le16(pkt_len);

cfg80211_rx_mgmt(&priv->wdev, priv->roc_cfg.chan.center_freq,
--
2.40.1